> We are moving to a Storagetek L700 (LTO) from 3570...(TSM 4.1.5 running on
> AIX 4 .3.3). I have some questions on migrating the data. The current plan
> is to connect the L700 to our box leaving our magstar connected as well. We
> will change the 3570 tapepool to read only. Then we will create a new pool
> for LTO and migrate data from our 3570 tapepool to the new LTO tapepool. My
> question concerns our offsite copypool. How do I handle it the data within
> it? Depending on how long the migration takes for our approx. 4 TB of data,
> I was thinking we could just do a backup of the LTO pool to copypool and
> once we know we have everything offsite, destroy the 3570 tapes??? I may be
> way off base so any suggestions would be helpful. I don't want to lose one
> little bit (or byte) of data..

You are basically on the right track. You don't have to do one monster
'backup stgpool' command. You can do a series of backup operations as data
flows into the onsite L700 pool and populate the offsite L700 pool
incrementally.

If you have large amounts of data in relatively short lived database backups,
you may want to start sending new backups to L700 and wait a while to migrate
old backups from 3570 tape. This would allow a large portion of the data to
age off, eliminating the need to migrate it.

The phrase 'destroy the 3570 tapes' makes me cringe a bit. The clean way to
deal with the old tapes once you have a full set of offsite copies on L700
tapes is to run 'delete volume' commands with 'discarddata=yes'.